Dude pulled a knife on him in an attempt to mug him
Victim got scared to the point where he pissed himself as he tried to hand over his wallet
He was panicking to the point where he dropped his wallet in his own piss
He picked it back up and went to handed it over but the mugger didn't want to touch it since it was covered in piss.
Mugger asked him to hand over whatever else he had.
Dropped a bunch of other stuff (Probably his phone and a pack of cigarettes or some ****)
Mugger took the dudes phone, his cigarettes, and his watch, and then ran off without taking the wallet.